Persistent Image says that it follows a script, but it does not say that it responds to stimuli, so not sure how to get the "computer" to talk with the "monitor" without re-casting the spell every time it runs a new process. This would make it hard to have an interactive ability, although it would work great for computer-generated cut-scenes.

Also, if you COULD figure out the input issue, if the image had to be re-cast with the results of the input, you would not see the results of your input for 6 seconds. Unless the persistent image is ALSO in the demi-plane that you're scrying into. At that point, however, it would be easier just to have the zombies/skeletons with colored cue cards.

Of course, this all depends on how you interpret "script"…